Have you ever wondered why identical twins aren’t, well, actually identical? Do you want to blame your parents for something about you that is different from everyone else in the family? Then you need to find out about Epigenetics.

The President of St John's College, Professor Maggie Snowling, in conversation with Dr Heather Bowman, a Fellow in Biological Sciences at St John's. They discuss Heather's research work as a biological oceanographer.